Remove alibi-detect and alibi-explain from MLServer base image due to license mismatch

[Snomaan6846]

Description

Currently, the MLServer base Docker image includes both alibi-detect and alibi-explain.
These two libraries are distributed under the Business Source License 1.1 (BSL 1.1), while MLServer itself is licensed under Apache 2.0.

This combination can be misleading to end users, since they may assume that the entire MLServer image is Apache 2.0 licensed and can be freely used in commercial environments. However, the inclusion of these libraries introduces potential licensing restrictions which could lead to accidental non-compliance.

---

Steps to Reproduce

1. Pull the latest MLServer image.
2. Inspect the installed libraries (pip show alibi and pip show alibi-detect).
3. Notice that both alibi-detect and alibi-explain are bundled by default with BSL 1.1.

pip show alibi-detect
Name: alibi-detect
Version: 0.12.1.dev0
Summary: Algorithms for outlier detection, concept drift and metrics.
Home-page: https://github.com/SeldonIO/alibi-detect
Author: Seldon Technologies Ltd.
Author-email: hello@seldon.io
License: Business Source License 1.1
Location: /opt/conda/lib/python3.10/site-packages
Requires: catalogue, dill, matplotlib, numba, numpy, opencv-python, pandas, Pillow, pydantic, requests, scikit-image, scikit-learn, scipy, toml, tqdm, transformers, typing-extensions

pip show alibi       
Name: alibi
Version: 0.9.7.dev0
Summary: Algorithms for monitoring and explaining machine learning models
Home-page: https://github.com/SeldonIO/alibi
Author: Seldon Technologies Ltd.
Author-email: hello@seldon.io
License: Business Source License 1.1
Location: /opt/conda/lib/python3.10/site-packages
Requires: attrs, blis, dill, matplotlib, numpy, pandas, Pillow, requests, scikit-image, scikit-learn, scipy, spacy, tqdm, transformers, typing-extensions
Required-by: mlserver-alibi-explain

---

Impact

• Users may unintentionally deploy MLServer in commercial settings under the assumption of full Apache 2.0 licensing.
• Legal and compliance risks due to mixing Apache 2.0 with BSL 1.1 dependencies.

---

[vaibhavjainwiz]

+1

We should not have alibi-detect and alibi-explain in default commercial build.